DESCRIPTION

BN_BLINDING_new() allocates a new BN_BLINDING structure and copies
the A and Ai values into the newly created BN_BLINDING object.

BN_BLINDING_free() frees the BN_BLINDING structure.

BN_BLINDING_update() updates the BN_BLINDING parameters by squaring
the A and Ai or, after specific number of uses and if the
necessary parameters are set, by re-creating the blinding parameters.

BN_BLINDING_convert_ex() multiplies n with the blinding factor A.
If r is not NULL a copy the inverse blinding factor Ai will be
returned in r (this is useful if a RSA object is shared amoung
several threads). BN_BLINDING_invert_ex() multiplies n with the
inverse blinding factor Ai. If r is not NULL it will be used as
the inverse blinding.

BN_BLINDING_convert() and BN_BLINDING_invert() are wrapper
functions for BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex()
with r set to NULL.

BN_BLINDING_set_thread_id() and BN_BLINDING_get_thread_id()
set and get the ``thread id'' value of the BN_BLINDING structure,
a field provided to users of BN_BLINDING structure to help them
provide proper locking if needed for multi-threaded use. The
``thread id'' of a newly allocated BN_BLINDING structure is zero.

BN_BLINDING_get_flags() returns the BN_BLINDING flags. Currently
there are two supported flags: BN_BLINDING_NO_UPDATE and
BN_BLINDING_NO_RECREATE. BN_BLINDING_NO_UPDATE inhibits the
automatic update of the BN_BLINDING parameters after each use
and BN_BLINDING_NO_RECREATE inhibits the automatic re-creation
of the BN_BLINDING parameters after a fixed number of uses (currently
32). In newly allocated BN_BLINDING objects no flags are set.
BN_BLINDING_set_flags() sets the BN_BLINDING parameters flags.

BN_BLINDING_create_param() creates new BN_BLINDING parameters
using the exponent e and the modulus m. bn_mod_exp and
m_ctx can be used to pass special functions for exponentiation
(normally BN_mod_exp_mont() and BN_MONT_CTX).

RETURN VALUES

BN_BLINDING_new() returns the newly allocated BN_BLINDING structure
or NULL in case of an error.

BN_BLINDING_update(), BN_BLINDING_convert(), BN_BLINDING_invert(),
BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() return 1 on
success and 0 if an error occured.

BN_BLINDING_get_thread_id() returns the thread id (a unsigned long
value) or 0 if not set.

BN_BLINDING_get_flags() returns the currently set BN_BLINDING flags
(a unsigned long value).

BN_BLINDING_create_param() returns the newly created BN_BLINDING
parameters or NULL on error.